EP1158939A1 - Procedes, systemes et instruments d'introduction d'implants prothetiques - Google Patents

Procedes, systemes et instruments d'introduction d'implants prothetiques

Info

Publication number
EP1158939A1
EP1158939A1 EP00913704A EP00913704A EP1158939A1 EP 1158939 A1 EP1158939 A1 EP 1158939A1 EP 00913704 A EP00913704 A EP 00913704A EP 00913704 A EP00913704 A EP 00913704A EP 1158939 A1 EP1158939 A1 EP 1158939A1
Authority
EP
European Patent Office
Prior art keywords
implant
inserter
rod
thumbscrew
lever
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP00913704A
Other languages
German (de)
English (en)
Inventor
Brian W. Mc Kinnon
David C. Kelman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Smith and Nephew Inc
Original Assignee
Smith and Nephew Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Smith and Nephew Inc filed Critical Smith and Nephew Inc
Publication of EP1158939A1 publication Critical patent/EP1158939A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4609—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/367—Proximal or metaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4607—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of hip femoral endoprostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30113—Rounded shapes, e.g. with rounded corners circular
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30113—Rounded shapes, e.g. with rounded corners circular
    • A61F2002/30121—Rounded shapes, e.g. with rounded corners circular with lobes
    • A61F2002/30123—Rounded shapes, e.g. with rounded corners circular with lobes with two diametrically opposed lobes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30125—Rounded shapes, e.g. with rounded corners elliptical or oval
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30153—Convex polygonal shapes rectangular
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30159—Concave polygonal shapes
    • A61F2002/30172—T-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30594—Special structural features of bone or joint prostheses not otherwise provided for slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
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    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A61F2002/30797—Blind bores, e.g. of circular cross-section internally-threaded
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
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    • A61F2002/308—Blind bores, e.g. of circular cross-section oblong
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/3401—Acetabular cups with radial apertures, e.g. radial bores for receiving fixation screws
    • A61F2002/3403—Polar aperture
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4625—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use
    • A61F2002/4627—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4625—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use
    • A61F2002/4628—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4629—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof connected to the endoprosthesis or implant via a threaded connection
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4681—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor by applying mechanical shocks, e.g. by hammering
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
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    • A61F2230/0006—Rounded shapes, e.g. with rounded corners circular
    • A—HUMAN NECESSITIES
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0008—Rounded shapes, e.g. with rounded corners elliptical or oval
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    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/0052—T-shaped

Definitions

  • the present mvention relates generally to methods, systems, and instruments for inserting prosthetic implants, instruments, and other devices and, more particularly, to methods, systems, and mstruments for inserting implants and other instruments into medullary canals of bones
  • a prosthetic implant In arthroplasty, a prosthetic implant is often inserted into a medullary canal of a bone
  • other instruments or devices may also need to be inserted Examples of these instruments include broaches, reamers, alignment tools, depth guides, and gauges
  • insertion of the implant or instrument typically requires the delivery of a force to the implant or instrument m order to drive the implant or instrument to a desired position within the bone
  • Various methods, systems, and instruments have been devised to assist in the placement of the implant or instrument at the desired position within a bone
  • an inserter or impactor is a commonly used device for driving an implant into the medullary canal of a bone
  • the inserter features a rod that is in some way connected to a frame and which runs through this frame and connects to one end of the implant, as by a threaded end on the rod which is received in a threaded bore in the end of the implant
  • the inserter features a load transfer surface integral to the frame near the end of the rod, which abuts against an impact surface at the end of the implant
  • the rod is securely connected to the implant in order to apply compression between the inserter and the implant, and more specifically to compress the impact surface of the inserter against the impact surface of the implant
  • a surgeon applies forces to the inserter as with a mallet and these forces are transferred through the inserter frame to the implant to cause the implant to move to the desired location
  • the surgeon disconnects the rod to remove the inserter from the implant
  • the inserter and implant may also become damaged if the rod retracts from within the implant
  • the load transfer surface on the inserter can become spaced from the implant This spacing may prevent the load transfer surface of the inserter from being properly aligned with the load transfer surface on the implant
  • the offset in load transfer surfaces can cause unequal loading within the surfaces resulting in stressing, chipping, or deformation of these surfaces
  • the impact forces may also place the inserter in motion relative to the implant and create a collision between the two members
  • the motion imparted to the inserter aggravates the potential for damage to the inserter or implant
  • An insertion device includes an engagement member, such as a rod, that is inserted into an object
  • the engagement member is contained within a member for transferring forces to the object, such as a frame, that has a load transfer surface, such as feet, for engaging and resting upon the object
  • a pre-load compression is applied between the inserter and the object to ensure proper seating of the inserter upon the object This compression ensures that impact forces are transferred to the object and are not diverted to the engagement member or to other portions of the inserter
  • the inserter includes a threaded rod which is inserted into the implant or instrument and a tension is applied to the rod
  • the inserter has a lever which, when closed, results in a resultant force between the rod and a frame of the inserter This resultant force directs the inserter frame onto the implant to firmly seat the inserter on
  • Figure 1 is a perspective view of an inserter according to a preferred embodiment of the invention
  • Figure 2(A) is a partial view of the inserter of Figure 1 at an interface with an implant having a slot recess
  • Figure 2(B) is a perspective view of an interface of an implant according to a second embodiment of the invention having a round recess
  • Figure 2(C) is a perspective view of an interface according to a third embodiment of the invention having an oval recess
  • Figure 3 is a plan view of the inserter of Figure 1 and its relationship to a femoral implant
  • Figure 4 is a side view of an inserter according to a second embodiment of the invention and its relationship to a femoral implant
  • Figure 5 is a side view of a stem inserter frame according to a preferred embodiment of the invention.
  • Figure 6 is a perspective view of stem inserter thumbscrew according to a preferred embodiment of the invention
  • Figure 7 is a perspective view of a stem inserter lever according to a preferred embodiment of the invention
  • Figure 8 is a perspective view of a stem inserter slider according to a preferred embodiment of the invention.
  • Figure 9 is a plan view of a stem inserter roller according to a preferred embodiment of the invention.
  • Figure 10 is a plan view of a stem inserter roller pin according to a preferred embodiment of the invention.
  • Figure 1 1 is a side view of a stem inserter rod according to a preferred embodiment of the invention
  • Figure 12 is a side view of a stem inserter female pin according to a preferred embodiment of the invention
  • Figure 13 is a side view of a stem inserter male pin according to a preferred embodiment of the invention.
  • Figure 14(A) is a perspective view of a captive ball lock interface according to an alternate aspect of the invention.
  • Figure 14(B) is a partial view in cross section of the interface of Figure 14(A),
  • Figure 14(C) is a partial view in cross section of the interface of Figure 14(A)
  • Figure 15 is a perspective view of a T-slot interface according to an alternate aspect of the invention
  • Figure 16(A) is a perspective view of a contracting collet lock interface according to an alternate aspect of the invention
  • Figures 16(B) to 16(E) are partial side views in cross section of the interface of Figure 16(A), showing the attachment of the contracting collet lock interface to an implant,
  • Figure 17 is a perspective view of a taper slot interface according to an alternate aspect of the invention.
  • Figure 18(A) is a perspective view of an interface according to an alternate aspect of the invention which includes a pegs and slot arrangement
  • Figure 18(B) is a perspective view of the post of Figure 18(A)
  • Figures 19(A) is a perspective view of an expanding collet lock interface according to an alternate aspect of the invention.
  • Figures 19(B) to 19(D) are partial views in cross section of the interface of Figure 19(A) showing the attachment of the expanding collet lock interface to an implant
  • Figure 20(A) is a perspective view of an interface according to an alternate aspect of the invention that has side slots for receiving collet or hook locks,
  • Figure 20(B) is a partial view in cross section of the interface of Figure 20(A),
  • Figure 21(A) is a perspective view of a key lock interface according to an alternate aspect of the invention.
  • Figures 21(B) to 21(D) are partial views in cross section of the interface of Figure 21(A) showing the attachment of the key lock interface to an implant
  • Figure 21(E) is a perspective view of the key of Figure 21(A),
  • Figure 22(A) is a side view in cross section of a chamfer friction lock interface with an acetabular shell according to an alternative embodiment of the invention
  • Figure 22(B) is a plan view of the acetabular shell of Figure 22(A)
  • Figure 23(A) is a side view in cross section of a chamfer shoulder lock interface with an acetabular shell according to an alternative embodiment of the invention
  • Figure 23(B) is a plan view of the acetabular shell of Figure 23(A)
  • Figure 23(C) is a plan view of an acetabular shell having a shoulder interface but no chamfer
  • Figure 24 is a diagrammatic side view of a locking latch arrangement according to an alternative embodiment of the invention
  • Figure 25 is a diagrammatic side view of a rack and pinion arrangement according to an alternative embodiment of the invention
  • Figure 26 is a diagrammatic side view of a scotch yoke arrangement according to an alternative embodiment of the invention.
  • Figure 27 is a diagrammatic side view of a toggle clamp arrangement according to an alternative embodiment of the invention.
  • Figure 28 is a diagrammatic side view of a secondary thumbscrew according to an alternative embodiment of the invention.
  • Figure 29 is a diagrammatic side view of a further embodiment of an inserter which has a biasing member between a thumbscrew and frame of the inserter
  • the inserter 10 includes a frame 12 having a surface 12A for receiving forces from an external source and a load transfer surface, which preferably comprises members 12D, for transferring these forces to another object, such as an implant 40
  • the forces may be received from mallet blows applied to the surface 12A and the inserter 10 passes these forces through its frame 12 to the members 12D
  • the members 12D are preferably feet that focus the forces upon the implant 40
  • the inserter 10 may be attached to the object through any suitable interface between the object and the inserter 10
  • the inserter 10 is attached to the implant 40 by turning a thumbscrew 14 so as to thread a rod 24 into the implant 40
  • a lever 16 is raised which, as will be described in greater detail below, produces a resultant force that directs the frame 12 of the inserter 10 toward the implant 40
  • This resultant force works to ensure that the inserter 10 does not become loose during use but instead ensures that the feet 12D are firmly seated on the implant 40
  • the resultant force generated by the inserter 10 consequently works to prevent any damage either to the rod 24, the frame 12, the implant 40, or other instruments that are being inserted
  • the surgeon does not need to periodically adjust the inserter 10 but rather can focus on inserting the implant 40 to the desired location
  • Figure 1 illustrates just one example of an interface between the frame 12 of the inserter 10 and the implant 40
  • the implant 40 includes a slot recess 42 for receiving the feet 12D of the frame 12
  • the rod 24 includes a threaded end 24D having a tip 24E which is inserted into a threaded recess 44 of the implant 40
  • the driving forces applied and transferred through the frame 12 of the inserter 10 from mallet blows are focused on the feet 12D and are transferred at these points to the implant 40
  • the driving forces are isolated from the threaded end 24D of the rod 24 as well as from the threaded recess 44 of the implant 40
  • the interface shown in Figures 1 and 2(A) is just one example of a suitable interface
  • the interface may include a round recess 46 formed on the implant 40 and feet having corresponding rounded end portions
  • the implant 40 may have an oval recess 48, as shown in Figure 2(C), and the feet may have a corresponding oval shape for being placed within the recess 48
  • the oval shape shown in Figure 2(C), as well as other non-circular shapes, are preferably over the circular shape since the inserter may need to be twisted during use and the oval shape prevents rotation of the inserter relative to the implant
  • the examples of the recesses shown in Figure 2(A) to 2(C) have walls which are generally perpendicular to a recessed surface Alternatively, the walls may be formed at other angles and this recessed surface may be irregularly shaped
  • the recess 42 may be V-shaped and the feet 12D may have a corresponding V- shape
  • the recess 42 may be V-shaped and the feet 12D may have a corresponding V
  • the inserter 10 includes a lever 16, a slider 18, and at least one biasing member 30
  • the lever 16 has a cammed surface 16D that moves the slider 18 toward the thumbscrew 14 when the lever 16 is pivoted from an open position to a closed position
  • the at least one biasing member 30 receives compressive forces from being positioned between the moving slider 18 and the thumbscrew 14 which opposes movement of the slider 18
  • the opposing forces include one component which is applied to the thumbscrew 14 in a direction away from the implant 40 and a second component that is applied to the slider 18 and frame 12 in a direction toward the implant 40
  • the resultant force is therefore one that firmly seats the feet 12D of the frame 12 on the implant
  • the biasing member 30 comprises a set of spring washers, such as Belleville spring washers manufactured by Lee Spring Company of Brooklyn, New York
  • the Belleville spring washers 30 are able to provide high loads in restricted spaces and a desired load can be calculated according to the configuration of the washers For example, washers which are all oriented in the same direction are considered to be in parallel whereas washers which are arranged in opposite configurations are considered to be in series
  • the Belleville spring washer comprises Part No 312-030-625, has a thickness of 0 030 inches, and requires a load of 178 lbs to flatten the washer
  • the spring constant of the washers 30 those skilled in the art can place the washers 30 in parallel or series to derive a desired force when the washers 30 are compressed a desired distance
  • This desired distance is the distance that the slider 18 travels toward the thumbscrew 14 after the spring engagement upon closing of the lever 16
  • the resultant force should be selected to be large enough to ensure proper seating of the feet 12D upon the implant 40, be small enough
  • the biasing member 30 is not limited to a spring washer but may be replaced with other elements
  • an inserter 10' may include a compression spring 32 positioned between the slider 18 and the thumbscrew 14 By closing the lever 16, the spring 32 becomes compressed and generates forces that cause the frame 12 of the inserter 10' to remain compressed against the implant 40
  • leaf springs or wave springs may be used to provide compression between the frame 12 and implant 40
  • a torsion spring could also be used or a solid material, such as rubber or elastic plastic, could be used to provide forces to the rod 24 and frame 12 to ensure compression between the inserter and implant or other instrument
  • the biasing member may be integral with the rod 24 itself or with the slider 18 itself
  • the rod may be formed of an elastic material or may include an elastic member that provides additional tension to the rod
  • the slider may also be made such that it provides a biasing action in a similar manner as the rod
  • the frame 12 of the inserter 10 has a surface 12A that is sized and shaped to receive forces from an external source, such as blows from a mallet
  • the forces applied to the surface 12A are transferred from surface 12 A, through a section 12B, along section 12C, to the feet 12D
  • the frame 12 includes a central aperture 12E within which the rod 24 is received
  • the feet 12D are placed on either side of the aperture 12E to evenly distribute forces to the implant 40
  • Section 12B may be grasped by a surgeon and includes a channel 12F, ledges 12G, and apertures 12H
  • the ledges 12G protrude inwardly from sides of the frame 12 and, as better shown in Figures 1, 3, and 4, limit movement of the thumbscrew 14 toward the feet 12D of the frame 12
  • thumbscrew 14 has recessed portions 14A, raised portions 14B, and a central aperture 14D which is sized and shaped to receive an upper section of the rod 24
  • the aperture 14D includes a portion with a reduced diameter which prevents an enlarged section 24A of the rod 24 from traveling toward the implant 40
  • the thumbscrew 14 also includes an aperture 14C for receiving a pin, such as a press fit pin, which secures thumbscrew 14 to rod 24
  • the press fit pin secures the thumbscrew 14 so that the rod 24 rotates upon rotation of the thumbscrew 14
  • thumbscrew 14 includes a threaded aperture for receiving a set screw, which secures thumbscrew 14 to rod 24 The set screw secures the thumbscrew 14 so that the rod 24 rotates upon
  • the lever 16 includes an aperture 16A about which the lever 16 pivots
  • the lever 16 terminates in a curved portion 16C which, as shown in Figure 3, provides a space between the lever 16 and the frame 12 of the inserter 10 This space is preferably large enough to allow a user to insert a finger into this aperture to apply forces to lower the lever 16 and pivot it away from the frame 12
  • the lever 16 also includes a ribbed portion 16B for being received within a corresponding slot within the frame 12
  • the lever 16 also includes a cammed portion 16D for moving the slider 18 toward the thumbscrew 14 when then lever 16 is pivoted toward the frame 12
  • the cammed portion 16D of the lever 16 is shaped so that the lever 16 is over- centered and is biased closed when placed against the frame 12
  • the lever 16 should not inadvertently become lowered and opened during the delivery of mallet blows to the frame 12 since the lever 16 must be forced beyond the apex of the cammed surface 16D in order to lower the lever 16 While closing the lever 16,
  • the slider 18 has an aperture 18 A through which the rod 24 passes
  • the slider 18 also includes members 18B that have apertures 18D
  • a roller 20, as shown in Figure 9, is inserted between the two members 18B and provides a relatively low friction interface between the slider 18 and the lever 16
  • the roller 20 has a central aperture 20A through which a roller pin 22 passes
  • the roller pin 22 is shown in more detail in Figure 10 and, in addition to being inserted into the roller 20, is also inserted through the apertures 18D of the slider 18
  • the roller pin 22 is contained within the apertures 18D of members 18B and consequently maintains the roller 20 within the members 18B as well
  • the roller pin 22 travels within the channel 12F within the frame 12
  • the rod 24 includes section 24A which has an enlarged diameter relative to portion 24B As discussed above, the section 24 A of the rod 24 is inserted within the thumbscrew 14 but is unable to pass completely through the thumbscrew 14 due to the shape of the central aperture 14D within the thumbscrew 14
  • the rod 24 also includes a section 24B which, as shown in Figures 3 and 4, is partially contained within the slider 18 and a section 24C which runs through section 12C of the frame 12
  • the threaded end 24D of the rod 24 has the tip 24E for being inserted into the implant 40
  • Aperture 24F is adapted to receive a press fit pin to secure the thumbscrew 14 to the rod 24
  • FIG. 12 and 13 A preferred embodiment of a pin for securing the lever 16 to the frame 12 is shown in Figures 12 and 13
  • the pin in this example is comprised of a female pin 26 and a corresponding male pin 28 with the female pin 26 having a threaded section 26B for receiving threads 28B on the male pin 28
  • Both the female pin 26 and the male pin 28 have slots 26A and 28 A, respectively, for receiving the end of a screw driver
  • the female pin 26 is passed through apertures 12H in the frame 12 and through aperture 16A in the lever 16 and the male pin 28 is passed through the other aperture 12H of the frame 12 and into the female pin 26
  • the pins 26 and 28, of course, are just one example of a way that the lever 16 may be secured in a pivotal fashion to the frame 12
  • Figures 14(A) to 14(C) illustrate a captive ball lock interface which includes members, such as balls, for being pressed into notches upon receipt of the inserter
  • Figure 15 depicts a T-slot interface in which the implant or instrument includes a T-slot and the inserter includes a T-shaped member for sliding into the slot
  • Figures 16(A) to (E) illustrate a contracting collet lock in which the inserter includes collet arms and an outer sleeve When placing the inserter onto the implant, the collet arms pass over a collet on the implant and the outer sleeve moves toward the implant to provide a secure attachment
  • Figure 17 depicts an interface in which the implant includes a taper slot and the inserter includes a correspondingly shaped member for being inserted into the slot
  • Figure 18(A) illustrates an implant having a post with pegs
  • Figure 18(B) shows a fastener on the inserter having slots for receiving the pegs The inserter is placed onto the implant with the pegs placed into the slots and the inserter is rotated in order to secure the two members together
  • the inserter includes collet arms which are placed within a T-shaped recess within the implant
  • the inserter also includes a center pin which moves toward the implant and forces the collet arms into engagement with the T-shaped recess
  • FIG. 20(A) and 20(B) This interface includes side slots on the implant as well as a slot on the top surface of the implant
  • the top slot may comprise any type of interface, such as a threaded recess that receives a threaded rod, and the inserter includes members for locking into the side slots of the implant These additional members on the inserter may be contracting collets or hook locks
  • FIG. 21 (A) to 21 (E) the inserter includes a key that is inserted into a lock within the implant As shown in the sequence depicted in Figures 21(B) to 21(D), the key is inserted into the lock and then rotated a quarter turn to lock the inserter to the implant
  • the invention is not limited to inserters for use with femoral implants but also relates to inserters for inserting other types of prosthetic implants, to prosthetic implants inserted into other bones, and even to devices, members, or structures other than prosthetic implants
  • other instruments and devices that may be driven to a desired position with the inserter includes broaches, reamers, alignment tools, depth guides, and gauges
  • the inserters may be used in applications that do not result in any impacting of a bone A force may need to be transferred through the inserter and delivered to another object for various reasons other than for forcing the implant to a desired position within a patient
  • an inserter is used to insert an acetabular shell
  • Figure 22(A) illustrates a chamfer friction lock interface between the inserter and an acetabular shell 50
  • Acetabular shell 50 includes a threaded aperture 52 through which the threaded end 54 of rod 56 is inserted
  • the acetabular shell 50 includes chamfer surface 58 Chamfer surface 58 and the end 60 of the frame 62 are formed in complementary shapes so that they join in a mating relationship
  • Figure 22(B) is a plan view of the acetabular shell 50
  • the inserter also includes a biasing member for forcing the end 60 into contact with the shell 50
  • the inserter shown in Figure 22(A) is able to generate a compressive force directing the end 60 toward the shell 50
  • Figure 23(A) depicts a chamfer shoulder lock interface with acetabular cup 70
  • acetabular shell 70 includes threaded aperture 72 for receiving the threaded end 74 of rod
  • the compression between the inserter and implant or instrument may be provided through a latch arrangement
  • the lever and slider may form a rack and pinion arrangement in which closing of the lever results in compression of the biasing member, as shown in Figure 25
  • the lever and slider may form a scotch yoke in which the lever has a pin that slides within a groove in the slider, as shown in Figure 26 By closing the lever, the pin travels along the groove and moves the slider so that the biasing member becomes compressed
  • the lever and slider may form a toggle clamp in which closing of the lever pushes the slider to compress the biasing member
  • Other mechanisms, devices, members may be used to impart compression between the inserter and the implant or instrument or tension to the rod
  • the invention is not limited to a lever for causing compression of the biasing member
  • a lever for causing a slider to compress the biasing member
  • other members or devices may be used to move a slider so that the biasing member becomes compressed
  • a secondary thumbscrew may be provided on a side of the slider opposite the biasing member, as shown in Figure 28 After tension has been applied to the rod through tightening of a main thumbscrew, such as thumbscrew 14, the secondary thumbscrew is rotated so as to move the slider closer to the thumbscrew 14
  • the inserters may include additional devices or structures for locking the lever 16 in a desired position
  • the inserter 10 may include structure or a device for preventing the lever 16 from inadvertently opening
  • the cam operated lever in combination with the biasing member is the preferred structure used in generating the compression between the inserter and the implant
  • the invention includes other possible structures or devices that exist which can be used to generate a compression
  • the biasing member 30, which preferably is the spring washer is inserted between the thumbscrew 14 and the frame 12 of the inserter The thumbscrew 14 is rotated until it is completely threaded within the implant or the instrument and then is rotated an additional amount to compress the spring washer 30
  • the one or more spring washers 30 provide tension to the rod 24 and generate a resultant force which compresses the frame 12 of the inserter upon the implant or instrument
  • the invention has been described with reference to the use of one or more biasing members to provide compression between the inserter and the implant or instrument
  • the biasing members ensure proper compression even if a rod retracts from within the implant or instrument
  • the one or more biasing members may ensure proper compression in response to other events For instance, backlash from actuating gears and looseness in mechanical system due to tolerances or physical deformation can also be compensated for by the one or more biasing members
  • the inserters according to the invention have advantages over existing inserters or impactors For one, a constant compression is applied between the inserters and the implant and this compression reduces any retraction of the rod from within the implant The compression also ensures that the inserter is properly seated upon the implant, even if the rod begins to unthread The inserters according to the invention should exhibit less damage to the rod during use as well as less damage to the implants The compression that is applied between the inserters and the implant direct impact forces to the load transfer surface of the inserter and not to other members, such as the rod Consequently, the impact forces should not damage the threads or cause any fracture of the rod
  • the compression by ensuring proper seating of the inserter upon the implant, prevents damage to the inserter and implant For example, the compression between the inserter and implant prevents any error in alignment between the two members Thus, potential damage due to an offset or due to a spacing between the inserter and implant is minimized Also, because the impact forces are not directed to the rod, the risk that an implant should be removed as a result of a broken rod is substantially reduced
  • the inserters according to the invention reduce complications during surgery and risk to the patient As discussed above, the inserters should result in less damage to the rod, other portions of the inserters, and to the implant The inserters therefore reduce the chance that a damaged implant will have to be removed and replaced with a new implant
  • the inserters also eliminate the need for the surgeons to repeatedly monitor tension of the rod Instead, the surgeons can focus on the surgical procedure, such as inserting the implant or instrument to the desired location The inserters therefore require less oversight during use and should allow surgeons to more efficiently and easily drive implants to their desired locations.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Prostheses (AREA)

Abstract

La présente invention concerne un dispositif d'insertion (10) comprenant une structure (12) pourvue d'un trou central à travers lequel on introduit une tige filetée (24). La tige filetée (24) est introduite dans un implant (40) pour fixer la dispositif d'insertion (10) dans l'implant (40). Un serre-joint (14) placé dans le sens de la longueur de la tige (24) est utilisé par un opérateur pour visser la tige (24) dans l'implant (40). Un élément de sollicitation (30), comportant de préférence un jeu de rondelles élastiques (30), est situé entre le serre-joint et une pièce coulissante (18). Un levier (16) placé sur le dispositif d'insertion présente une surface à came qui force la pièce coulissante (18) en direction du serre-joint (14), lorsque le levier (16) est fermé. Lorsque la pièce coulissante (18) avance vers le serre-joint (14), les rondelles élastiques (30) sont comprimées et produisent des forces opposées qui s'exercent sur le serre-joint (14) et sur la pièce coulissante (18). Ces forces opposées sont transférées à la tige et à la structure (9) du dispositif d'insertion (10) et produisent une force résultante qui provoque une force de compression s'exerçant entre le dispositif d'insertion (10) et l'implant (40). Cette force résultante doit fermement placer le dispositif d'insertion (10) sur l'implant (40) et réduire le risque que des forces appliquées sur le dispositif d'insertion (10) soient déviés sur la tige (24), amenant cette dernière à se lâcher ou à se libérer. Par conséquent, lors de l'opération, le chirurgien ou l'assistant place la tige filetée (24) dans l'implant (40) et la serre au moyen du serre-joint (14). Après que la tige (24) ait été serrée manuellement, le levier (16) est levé pour produire la force résultante qui comprime le dispositif d'insertion (10) sur l'implant (40).
EP00913704A 1999-03-03 2000-03-03 Procedes, systemes et instruments d'introduction d'implants prothetiques Ceased EP1158939A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12263199P 1999-03-03 1999-03-03
US122631P 1999-03-03
PCT/US2000/005442 WO2000051530A1 (fr) 1999-03-03 2000-03-03 Procedes, systemes et instruments d'introduction d'implants prothetiques

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EP1158939A1 true EP1158939A1 (fr) 2001-12-05

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US (1) US6626913B1 (fr)
EP (1) EP1158939A1 (fr)
JP (1) JP2002537897A (fr)
AU (1) AU769458B2 (fr)
CA (1) CA2362792A1 (fr)
WO (1) WO2000051530A1 (fr)

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JP2002537897A (ja) 2002-11-12
US6626913B1 (en) 2003-09-30
AU3510000A (en) 2000-09-21
AU769458B2 (en) 2004-01-29
CA2362792A1 (fr) 2000-09-08
WO2000051530A1 (fr) 2000-09-08

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